Move resync to TrackSender interface so that it can be called directly from up track (#2755)

pkg/rtc/mediatracksubscriptions.go

@@ -330,14 +330,6 @@ func (t *MediaTrackSubscriptions) closeSubscribedTrack(subTrack types.Subscribed
 	}
 }
 
-func (t *MediaTrackSubscriptions) ResyncAllSubscribers() {
-	t.params.Logger.Debugw("resyncing all subscribers")
-
-	for _, subTrack := range t.getAllSubscribedTracks() {
-		subTrack.DownTrack().Resync()
-	}
-}
-
 func (t *MediaTrackSubscriptions) GetAllSubscribers() []livekit.ParticipantID {
 	t.subscribedTracksMu.RLock()
 	defer t.subscribedTracksMu.RUnlock()

pkg/sfu/downtrack.go

@@ -63,6 +63,7 @@ type TrackSender interface {
 		layer int32,
 		publisherSRData *buffer.RTCPSenderReportData,
 	) error
+	Resync()
 }
 
 // -------------------------------------------------------------------